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The submillimeter galaxy (SMG) HERMES J105751.1+573027 (hereafter HLock01) atz = 2.9574 +/- 0.0001 is one of the brightest gravitationally lensed sourcesdiscovered in the Herschel Multi-tiered Extragalactic Survey. Apart from thehigh flux densities in the far-infrared, it is also extremely bright in therest-frame ultraviolet (UV), with a total apparent magnitude m_UV = 19.7 mag.We report here deep spectroscopic observations with the Gran TelescopioCanarias of the optically bright lensed images of HLock01. Our results suggestthat HLock01 is a merger system composed of the Herschel-selected SMG and anoptically bright Lyman break-like galaxy (LBG), separated by only 3.3 kpc inprojection. While the SMG appears very massive (M* = 5x10^11 Msun), with ahighly extinguished stellar component (A_V = 4.3), the LBG is a young,lower-mass (M* = 1x10^10 Msun), but still luminous (10xL*_UV) satellite galaxy.Detailed analysis of the high signal-to-noise (S/N) rest-frame UV spectrum ofthe LBG shows complex kinematics of the gas, exhibiting both blueshifted andredshifted absorption components. While the blueshifted component is associatedwith strong galactic outflows from the massive stars in the LBG, as is commonin most star-forming galaxies, the redshifted component may be associated withgas inflow seen along a favorable sightline to the LBG. We also find evidenceof an extended gas reservoir around HLock01 at an impact parameter of 110 kpc,through the detection of C II 1334$\AA$ absorption in the red wing of a brightLy-alpha emitter at z = 3.327. The data presented here highlight the power ofgravitational lensing in high S/N studies to probe deeply into the physics ofhigh-z star forming galaxies.

The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas